{"product_id":"pharos-ptl600-replacement-battery-37v-2400mah-li-polymer","title":"Pharos PTL600 Replacement Battery 3.7V 2400mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePharos PTL600 \/ PTL600E — 3.7V Li-Polymer Replacement Battery (PZX33)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2400mAh Li-Polymer cell replacing OEM part PZX33 in the Pharos PTL600 and PTL600E smartphones. It restores calling, messaging, and app functionality when the original cell has degraded or failed. Voltage and connector match the original factory spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePTL600 and PTL600E compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay geometry, voltage rail, and BMS handshake protocol — one cell fits either variant without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on PTL600-series hardware. The BMS accepted the charge IC handshake without fault flags, and the protection circuit tripped correctly at low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% uninterrupted. This gives the fuel gauge IC one full sweep of the new cell's discharge curve before it starts reporting accurate percentages.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the PTL600 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a slightly different voltage-to-capacity curve than the aged cell the fuel gauge IC was calibrated against. When the modem fires a transmission burst or the screen peaks in brightness, current draw spikes sharply. If the fuel gauge still thinks 25% equals a higher voltage than the new cell actually delivers under that load, the protection circuit reads a voltage cliff and shuts the phone down. One full discharge-charge cycle resets the coulomb counter and maps the new cell's real discharge curve. After that cycle, the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePTL600 not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge during storage. If this battery sat unused long enough to drop below approximately 2.5V per cell, the BMS enters lockout mode to prevent damage — and the phone will not power on at all. Connect the phone to a wall charger, not a PC USB port, and leave it for 15–20 minutes without pressing the power button. The charge IC needs to trickle current into the cell to lift it above the BMS recovery threshold before normal charging can begin. Once the charge indicator appears on screen, the cell has cleared lockout.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405147275354,"sku":"BWCS-EX500XL-1","price":28.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405147308122,"sku":"BWCS-EX500XL-2","price":32.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405147340890,"sku":"BWCS-EX500XL-3","price":35.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EX500XL-big.webp?v=1779370262","url":"https:\/\/batteryweb.com\/products\/pharos-ptl600-replacement-battery-37v-2400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}